drivers/gpu/drm/msm/msm_fb.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "msm_drv.h"
  19 #include "msm_kms.h"
  20
  21 #include "drm_crtc.h"
  22 #include "drm_crtc_helper.h"
  23
  24 struct msm_framebuffer {
  25         struct drm_framebuffer base;
  26         const struct msm_format *format;
  27         struct drm_gem_object *planes[2];
  28 };
  29 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
  30
  31
  32 static int msm_framebuffer_create_handle(struct drm_framebuffer *fb,
  33                 struct drm_file *file_priv,
  34                 unsigned int *handle)
  35 {
  36         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  37         return drm_gem_handle_create(file_priv,
  38                         msm_fb->planes[0], handle);
  39 }
  40
  41 static void msm_framebuffer_destroy(struct drm_framebuffer *fb)
  42 {
  43         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  44         int i, n = drm_format_num_planes(fb->pixel_format);
  45
  46         DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);
  47
  48         drm_framebuffer_cleanup(fb);
  49
  50         for (i = 0; i < n; i++) {
  51                 struct drm_gem_object *bo = msm_fb->planes[i];
  52                 if (bo)
  53                         drm_gem_object_unreference_unlocked(bo);
  54         }
  55
  56         kfree(msm_fb);
  57 }
  58
  59 static int msm_framebuffer_dirty(struct drm_framebuffer *fb,
  60                 struct drm_file *file_priv, unsigned flags, unsigned color,
  61                 struct drm_clip_rect *clips, unsigned num_clips)
  62 {
  63         return 0;
  64 }
  65
  66 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  67         .create_handle = msm_framebuffer_create_handle,
  68         .destroy = msm_framebuffer_destroy,
  69         .dirty = msm_framebuffer_dirty,
  70 };
  71
  72 #ifdef CONFIG_DEBUG_FS
  73 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  74 {
  75         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  76         int i, n = drm_format_num_planes(fb->pixel_format);
  77
  78         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  79                         fb->width, fb->height, (char *)&fb->pixel_format,
  80                         fb->refcount.refcount.counter, fb->base.id);
  81
  82         for (i = 0; i < n; i++) {
  83                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  84                                 i, fb->offsets[i], fb->pitches[i]);
  85                 msm_gem_describe(msm_fb->planes[i], m);
  86         }
  87 }
  88 #endif
  89
  90 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
  91 {
  92         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  93         return msm_fb->planes[plane];
  94 }
  95
  96 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
  97 {
  98         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  99         return msm_fb->format;
 100 }
 101
 102 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 103                 struct drm_file *file, struct drm_mode_fb_cmd2 *mode_cmd)
 104 {
 105         struct drm_gem_object *bos[4] = {0};
 106         struct drm_framebuffer *fb;
 107         int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);
 108
 109         for (i = 0; i < n; i++) {
 110                 bos[i] = drm_gem_object_lookup(dev, file,
 111                                 mode_cmd->handles[i]);
 112                 if (!bos[i]) {
 113                         ret = -ENXIO;
 114                         goto out_unref;
 115                 }
 116         }
 117
 118         fb = msm_framebuffer_init(dev, mode_cmd, bos);
 119         if (IS_ERR(fb)) {
 120                 ret = PTR_ERR(fb);
 121                 goto out_unref;
 122         }
 123
 124         return fb;
 125
 126 out_unref:
 127         for (i = 0; i < n; i++)
 128                 drm_gem_object_unreference_unlocked(bos[i]);
 129         return ERR_PTR(ret);
 130 }
 131
 132 struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 133                 struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 134 {
 135         struct msm_drm_private *priv = dev->dev_private;
 136         struct msm_kms *kms = priv->kms;
 137         struct msm_framebuffer *msm_fb;
 138         struct drm_framebuffer *fb = NULL;
 139         const struct msm_format *format;
 140         int ret, i, n;
 141         unsigned int hsub, vsub;
 142
 143         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 144                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 145                         (char *)&mode_cmd->pixel_format);
 146
 147         n = drm_format_num_planes(mode_cmd->pixel_format);
 148         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
 149         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
 150
 151         format = kms->funcs->get_format(kms, mode_cmd->pixel_format);
 152         if (!format) {
 153                 dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
 154                                 (char *)&mode_cmd->pixel_format);
 155                 ret = -EINVAL;
 156                 goto fail;
 157         }
 158
 159         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 160         if (!msm_fb) {
 161                 ret = -ENOMEM;
 162                 goto fail;
 163         }
 164
 165         fb = &msm_fb->base;
 166
 167         msm_fb->format = format;
 168
 169         for (i = 0; i < n; i++) {
 170                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
 171                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
 172                 unsigned int min_size;
 173
 174                 min_size = (height - 1) * mode_cmd->pitches[i]
 175                          + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
 176                          + mode_cmd->offsets[i];
 177
 178                 if (bos[i]->size < min_size) {
 179                         ret = -EINVAL;
 180                         goto fail;
 181                 }
 182
 183                 msm_fb->planes[i] = bos[i];
 184         }
 185
 186         drm_helper_mode_fill_fb_struct(fb, mode_cmd);
 187
 188         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 189         if (ret) {
 190                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 191                 goto fail;
 192         }
 193
 194         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 195
 196         return fb;
 197
 198 fail:
 199         if (fb)
 200                 msm_framebuffer_destroy(fb);
 201
 202         return ERR_PTR(ret);
 203 }